Underfeed stoker



l 623,423 Aprll 5, 1927. E. LUNDGREN. l

UNDERFEED sToKER Filed April 19. 1923 Patented Apr. 5, 1927.

UNITED ASTATES PATENT OFFICE.

EDWIN LUNDGREN, F FREDERICK, MARYLAND, ASSIGNOR T0 COMBUSTION ENGI- NEERING CORPORATION, 0F NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

UNDERFEED s'roxnn.

Application filed April 19, 1923. Serial No. 633,696.

My invention relates to underfeed stokers and more particularly to underfeed stokers of the inclined multiple retort type.

The principal object of the invention is to provide novel and improved means for controlling the admission of air to the air supplying surfaces of the underfeed section of stokers of the type above indicated.

The following is a description of my invention, reference being had to the accompanying'drawings, in which,

Figure 1 is a longitudinal sectional view,

y partly in elevation, of a portion of an underfeed Stoker embodying features of the invention in their preferred form;

Fig. 2 is a detail sectional view, on an enlarged scale, of a portion of the tuy`ere structure of the stoker illustrated in` Fig. l;

Fig. 3 is a detail plan View of one of the tuyre blocks forming a component part of the -tuyre structure; and

Figs. 4 and 5 are views similar to Fig. 2 but showing modified forms of tuyre structures.

The underfeed Stoker. illustrated in the drawings is provided with a wind box 2 v and downwardly inclined fuel retorts 4 that are arranged side 'by side and spaced apart with a tuyre' structure 6 spanningthe margins of the side walls of adjacent retorts, the tuyre structure being made up of tuyre blocks.

The tuyre blocks as usual are arranged one above the other in overlapping relation and the blocks are secured together by a depending hook-shaped member 8l on the under side of each of them that extends through an aperture in the next block below and hooks under the forward end wall of -w the aperture. Each block is provided with a depending marginal rib l() that rests upon a rib 12 on the top side of the next block below. The underside of each rib 1() is corrugated so as to cooperate with the adjacent rib 12 to form air openings 14. These air openings 14 are in communication with the wind box through the spaces between the blocks inside of the ribs 10 and 12.

In the present construction the desired air control for the different parts of the fuel bed is accomplished'by the construction and arrangement of the tuyre blocks themselves, or by means associated with each tuyre block. In the construction illustrated in Figs. 1, 2 and 3 of the drawings, each tuyre' block is provided with an air obstructing rib 16 extending across thel forward end of the block inside of the rib 12 so as to restrict the passage of air through the spaces between the blocks and hence through the air openings 14. By making the ribs 16 of the several tuyre blocks of different heights it will be apparent that the supply ofair tothe different parts of the fuel bed may be regulated as desired. Asshown, the ribs 16 are removably mounted on the tuyre blocks so as to enable the proper sizes of ribs to be conveniently supplied to the different tuyre blocksto secure the result desired.

To provide for this, the ribs are each provided with a longitudinally extending depending tongue 18 Which is received in a slot in the tuyre block.

In the construction shown in Fig. .4 thev desired air control is secured by' varying the thickness of the walls of the tuyre blocks inside of the ribs 10 and 12.

In the construction shown in Fig. 5 the desired air control is secured by making the air openings 14 of the several tuyre blocks of \dii'erent sizes.

As will be evident to those skilled in the art, my invention permits of various modifica-tions without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. An underfeed Stoker having, in combination, a wind box, a plurality of downwardly inclined fuel retorts arranged side by side and spaced apart, and fuel supporting tuyere blocks spanning the margins of the side walls of adjacent retorts with the air passages of different blocks of different capacities so as to cause air passing from the wind box through the blocks to be supplied in different quantities lto thev fuel supporting surfaces of the different blocks, respectively, said blocks having provision for varying the capacity of their air passages.

2. An underfeed stoker having, in combination, a wind box, a plurality of downwardly inclined fuel retorts arranged side by side and spaced apart, fuel sup orting tuyre blocks arranged in Voverlapping relation spanning the margins of the side Walls of adjacent retorts,-.and air obstructing members of dilferent sizes removably mounted on the blocks, respectively, for obstructing the passage of air through the blocks from the wind box so as to Cause air .passing from the Wind box through the blocks to be-supplied in different quantities to the fuel supporting surfaces of the different blocks, respectively.

3. An underfeed Stoker having, in combination, a wind box, a plurality of downwardlyinclined fuel retorts arranged side by side and spaced apart, fuel supporting tuyre blocks arranged one upon the other in overlapping relation and spanning the margins o the side Walls of adjacent retorts, the forward portion of each of said overlying blocks having a depending marginal rib that rests upon the .top ofthe next underlying block, the under side of eachof said ribs havinga plurality of corruga` tions so as to cooperate with the top side of andv airobstructing means associated with' each block for obstructing the passage of air through'the blocks from the Wind box so as to cause air passing ,from the wind box through the blocks to be supplied in diferent quantities to the fuely supporting surfaces of the different blocks,`respectively.

" EDWIN LUNDGrRIYN. 

